How to remove iMessage, if I can't use the old SIM card?

I've traveled abroad and used a temporary SIM card with my iPhone 6.

Now I'back home, inserted my regular SIM card but iMessage continues to try to register with the temporary number, I used abroad.

Although I always temporary SIM card, it is useless in my country and that's why I can't receive the confirmation code to unregister the temporary application number.

How can I reset iMessage or know that I need to register with my local number and not the temporary?

Tried everything and read a number of forums, but nothing seems to work.

See this--> https://selfsolve.apple.com/deregister-imessage

Tags: iPhone

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